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LOUIS

L.O.U.I.S - LOW COST USB ISDN SOLUTION

STMicroelectronics 

ST5481

5 - ISDN ACCESS

The device is directly connected to the ISDN line

at S0 interface point.

4 pins are dedicated to this access:

LIP, LIN: receive AMI differential signals inputs

connected to the appropriate transformer LOP,

LON: transmit AMI differential signals outputs

connected to the appropriate transformer.

The S interface access sub-function is clock-

feeded by a 15.36MHz clock signal from the

on-chip oscillator.

I431 recommendation protocols are fully imple-

mented.

The activation / deactivation command manage-

ment is done by the device.

5.1 - ISDN S Interface Synoptic

See Figure 3.

6 - USB ACCESS

The device is directly connected to the USB bus.

4 pins are dedicated to this access:

Figure 3 : S-Interface Block Diagram

DP, DM for data exchange. VBUS, GNDBUS as

power lines.

The data transfer rate is 12 MBits. The clock is

extracted from the differential lines DP, DM by a

digital PLL from a 48MHz internal clock. This

48MHz clock is created from the 15.36MHz clock.

The USB protocol is fully implemented following

the 1.0 USB specification.

6.1 - USB Normalization

This specification refers to USB normalization

documents:

– Universal Serial Bus Specification revision 1.0

– Universal Serial Bus Common Class Specifica-

tion revision 1.0

– ST5481 belongs to the VENDOR SPECIFIC

DEVICE CLASS and to a vendor specific

subclass defined as ISDN MODEM DEVICE

SUBCLASS.

It presents ONE INTERFACE belonging to the

VENDOR SPECIFIC INTERFACE CLASS and a

vendor specific interface subclass defined as

ISDN SOFT MODEM INTERFACE SUBCLASS.

It satisfies to a vendor specific control protocol

called ISDN SOFT MODEM PROTOCOL.

- Tx multiframe control

- D channel monitoring

- Loopbacks

- Frame construction

- AMI code generation

TXNUM

- C/I control

- Activation state machine

- Master clocks generation

- D & E channel processing

CONTROL

Line

Driver

Line Signal

Detector

- Auto threshold controller

- Auto equalizer controller

Pre Filter &

equalizer

Rx

- Digital PLL, line synchronization

- AMI decoder

- Frame synchronization & polarity check

- Signal ID

Slicers

- Multiframe control.

RXNUM

2x6 bits DACs

6/18

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